Richard W.M. Jones wrote:
Daniel P. Berrange wrote:
On Mon, Jul 16, 2007 at 11:30:33AM -0500, Anthony Liguori wrote:
Richard W.M. Jones wrote:
Anthony Liguori wrote:
For instance, let's say at a university they use an ldap directory
to authenticate users and they decide to implement a migration
handler that uses that for authentication. They may name this
"uni://" and it'll just work. How would they get at this in
libvirt without exposing URIs directly?
My latest proposal[1] has a transport parameter (a string) which
covers this, in as much as it would allow you to construct URIs
which are:
<transport>://<hostname>:<port>
SSH requires:
ssh://[user@]hostname[:port]
So that wouldn't work :-(
Sure it would - rich was just showing simplified syntax - the URI
rules/spec allow for a username and we already use this syntax with a
username in the remote driver URIs. eg
$ virsh --connect
qemu+ssh://root@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx/system list --all
Anthony is right that my revised proposal limits the migration to just
three parameters: transport, hostname and port.
https://www.redhat.com/archives/libvir-list/2007-July/msg00227.html
Perhaps instead we should replace hostname with a URI parameter,
understood as either a simple hostname, IP address, a "hostname:port"
string [IPv6?], or a full URI. However I feel inevitably this is
going to cause hypervisor dependencies to come into libvirt code,
which should be avoidable.
I don't think it's really a bad thing. I think if someone is writing
pretty straight forward code that does something like migrate a VM from
one host to another, then that code ought to be portable between
hypervisors with no effort.
However, if they are doing something more sophisticated like using a
custom migration transport and interacting with KVM through libvirt,
then yes, it's hypervisor dependent. I don't really see this as a
problem though.
Regards,
Anthony Liguori
Another choice might be to go back to the list of parameters again,
and have configurable VIR_MIGRATE_TRANSPORT, VIR_MIGRATE_USERNAME and
so on...
Rich.
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